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If the vectors bar(a) = 2bar(i) -bar(j)...

If the vectors `bar(a) = 2bar(i) -bar(j) + bar(k), bar(b) = bar(i) + 2bar(j)-3bar(k), bar(c ) = 3bar(i) + pbar(j) +5bar(k)` are coplanar then find p.

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The correct Answer is:
`= -4`
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